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In “Two Motors and Everything But Coffee,” our entry for February 28, we detailed Pierre-Jean Beney’s Hacker motor-powered Trikebuggy.  Pierre-Jean wants to change things, including, “The motor, the prop, the battery and the wing… So I am still somewhat away from where I want to have….” Currently, it takes 2,000 propeller revolutions per minute to maintain level flight.  The LiF2PO4 batteries allow a current draw of 160 Amps at 48 Volts, and will produce level flight power for about 22 minutes at this rate.  These are, according to Pierre-Jean, very safe batteries, but heavy.  Pierre-Jean’s new batteries are Li-Po, which will give 52 Volts at the same amperage, but are, in his estimation, less safe.  They are also lighter, weighing only 6.6 kilograms …